* {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

.clearfix::before,
.clearfix::after {
    display: table;
    content: "";
}

.clearfix::after {
    clear: both;
}

.header {
    width: 100%;
    background-color: #333333;
    height: 80px;
}

.center {
    width: 960px;
    margin: 0 auto;
}

.logo {
    float: left;
    padding-top: 15px;
    color: #ffffff;
    font-weight: bold;
    font-size: 30px;
}

.header li {
    float: right;
    margin-top: 10px;
}

.header li a {
    color: #ffffff;
    margin-left: 10px;
    text-decoration: underline;
    font-size: 18px;
}

.header li a:hover {
    color: #0AAAFF;
    margin-left: 10px;
}

.banner {
    float: left;
    width: 100%;
    height: 300px;
    background-color: #66bb33;
}

.banner div {
    padding-right: 185px;
    /* padding-top: 200px; */
    height: 50px;
}

.banner li {
    margin-right: 100px;
}

.banner a {
    float: right;
    margin-top: 200px;
    margin-right: 20px;
    width: 30px;
    height: 75%;
    text-align: center;
    line-height: 35px;
    border: 1px solid #333333;
    color: rgba(0, 0, 0, 0.5);
    background-color: rgba(255, 255, 255, 0.5);
}

.banner a:hover {
    margin-top: 185px;
    height: 100%;
    line-height: 50px;
    margin-bottom: 1000px;
    color: #333333;
    background-color: rgba(255, 255, 255, 0.8);
}

.nav {
    margin: 0 auto;
}

.nav-box {
    float: left;
    width: 100%;
    height: 70px;
    border-bottom: 3px solid #dddddd;
    border-collapse: collapse;
}

.nav-box ul {
    margin-left: 25%;
}

.nav-box li {
    float: left;
    width: 115px;
    height: 50px;
    border: 3px solid #dddddd;
    border-radius: 30% 30% 0 0;
    margin-top: 17px;
    margin-left: -3px;
    text-align: center;
    line-height: 50px;
    background-color: #eeeeee;
}

.nav-box a {
    color: #000000;
}

.nav-box a:hover li {
    border-bottom-color: #ffffff;
    background-color: #ffffff;
}

body {
    position: relative;
}

.content {
    float: left;
    /* height: 450px; */
    width: 1600px;
    /* 使用position定位后float不起作用了 */
    /* position: absolute;
    top:450px;
    left: 50%; */
    /* margin-left: -800px; */
    margin-left: 20%;
    /* background-color: pink; */
}

.line1 {
    float: left;
    margin-top: 20px;
    margin-left: 25px;
}

.line1 div {
    float: left;
    width: 467px;
    height: 300px;
    margin-right: 50px;
    border: 2px solid #eeeeee;
    text-align: center;
    line-height: 300px;
    color: #000000;
}

.line2 {
    float: left;
    margin-top: 20px;
    margin-left: 25px;
}

.line2 div {
    float: left;
    width: 330px;
    height: 300px;
    margin-right: 59px;
    border: 2px solid #eeeeee;
    text-align: center;
    line-height: 300px;
    color: #000000;
}

.bottom {
    float: left;
    width: 100%;
    height: 200px;
    color: #ffffff;
    font-size: 20px;
    text-align: center;
    line-height: 200px;
    background-color: #333333;
}